What does promise do?

Vue is a popular front-end framework, and you often encounter various errors and problems when developing applications. Among them, Uncaught(inpromise)TypeError is a common error type. In this article, we will discuss its causes and solutions. What is Uncaught(inpromise)TypeError? Uncaught(inpromise)TypeError error usually appears in

In daily life, we often encounter problems between promises and fulfillment. Whether in a personal relationship or a business transaction, delivering on promises is key to building trust. However, the pros and cons of commitment are often controversial. This article will explore the pros and cons of commitments and give some advice on how to keep your word. The promised benefits are obvious. First, commitment builds trust. When a person keeps his word, he makes others believe that he is a trustworthy person. Trust is the bond established between people, which can make people more

Detailed explanation of Promise.resolve() requires specific code examples. Promise is a mechanism in JavaScript for handling asynchronous operations. In actual development, it is often necessary to handle some asynchronous tasks that need to be executed in sequence, and the Promise.resolve() method is used to return a Promise object that has been fulfilled. Promise.resolve() is a static method of the Promise class, which accepts a

Browser compatibility: Which browsers support Promises? As the complexity of web applications continues to increase, developers are eager to solve the problem of asynchronous programming in JavaScript. In the past, developers often used callback functions to handle asynchronous operations, but this resulted in code that was complex and difficult to maintain. To solve this problem, ECMAScript6 introduced Promise, which provides a more intuitive and flexible way to handle asynchronous operations. Promise is a method used to handle exceptions

Use Promise objects to change ordinary functions to return Promise to solve the problem of callback hell. Understand the success and failure calling logic of Promise and make adjustments flexibly. Understand the core knowledge, use it first, and slowly integrate and absorb the knowledge.

The promise object states are: 1. pending: initial state, neither success nor failure state; 2. fulfilled: means the operation was successfully completed; 3. rejected: means the operation failed. Once a Promise object is completed, it will change from the pending state to the fulfilled or rejected state, and cannot change again. Promise objects are widely used in JavaScript to handle asynchronous operations such as AJAX requests and timed operations.

Promise is a programming pattern for handling asynchronous operations. It is an object that represents the final completion or failure of an asynchronous operation. It can be seen as a commitment to asynchronous operations. It can better manage and organize asynchronous code. , making the code more readable and maintainable. Promise objects have three states: pending, fulfilled and rejected. The core idea of ​​Promise is to separate asynchronous operations from callback functions and express the dependencies between asynchronous operations through chain calls.

Advantages: asynchronous and non-blocking, does not block the main thread; improves code readability and maintainability; built-in error handling mechanism.